Why is there no connecting line? (FF)

purpletulip

I don't have a line connecting yesterday's temp to today's and I can't find an answer on why. 

I bet someone on here knows.... 

lovemypups1

did you click the discard box on accident?

Suzzy2380

I only get a dot like that when I discard a temp, did you do that?

Edit: typo

purpletulip

*blushing*

Yes, yes I did accidentally hit the discard button.

Thank you!